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12=2x+15
We move all terms to the left:
12-(2x+15)=0
We get rid of parentheses
-2x-15+12=0
We add all the numbers together, and all the variables
-2x-3=0
We move all terms containing x to the left, all other terms to the right
-2x=3
x=3/-2
x=-1+1/2
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